Which two air masses predominantly influence weather in the United States?

The choice of Continental Polar and Maritime Tropical as the two predominant air masses influencing weather in the United States is correct due to the characteristics and origins of these air masses.

Continental Polar air masses are typically cold and dry, originating over land in polar regions. They play a significant role in bringing cold air during winter months, especially in the northern parts of the United States. This air mass can lead to clear skies and cooler temperatures when it moves southward.

On the other hand, Maritime Tropical air masses are warm and moist, forming over warm ocean waters. They bring warm, humid conditions, especially in the summer, and are often responsible for storm systems, heavy rainfall, and increased humidity across much of the United States.

The interaction between these two air masses—cold, dry air from the north colliding with warm, moist air from the south—often leads to dynamic weather patterns, including thunderstorms and other severe weather events. This combination is fundamental in understanding the complexity of the United States' weather systems.

While other air masses like Maritime Polar and Continental Tropical also contribute to weather patterns, it is the influence of Continental Polar and Maritime Tropical that is most significant in shaping weather across a wide range of regions in the U.S.